the basis of this idea is that each fighting unit (and most buildings) will be composed of a hull object, in which sits a functional module (or two?). the hulls will be available in many different types such as tanks, walkers, boats, planes and turrets. the attatched functional module will take the role of "what does the unit actually do", i.e. a constructor module, a plasma cannon module, a solar panel module, etc etc. with functions similar to those seen in *A games (no need to get too fancy... yet)
the idea is that you will be able to quickly and easily construct custom units depending on what situations you are faced with in the game. unlike micro modules, you will only be able to add as many modules to your hulls as there are slots available (im envisioning the teched up hulls to have two or more slots for modules, and factories to have four slots)
also unlike micro modules, hulls and modules that are attatched will stay attatched forever (until it dies etc.) except for the commander who should be able to hop into whatever sort of vehicle he likes whenever he likes (after all, he's the boss

here are some pics of what i'm talking about, sorry about the horrible quality, my scanner gave a death rattle when i turned it on so i had to resort to a digital camera, and i drew these in about half an hour with a ballpoint and a brown pencil crayon


^^this shows some of the ideas i had for basic units (tier one if you will) note the square holes into which the modules will fit

^^some other ideas i had for more advanced units as well as a factory
and now comes me asking for advice. you can see how i've made the modules square in order to fit into the hulls; i was thinking that using a transport behavior to hold the modules in place after noticing the t1 transports in BA physically hold the units in place, and that commanders can still build while in transport; essentially i'd need to be able to have the modules function as they should do once inside a hull such as shoot or build or generate power or what have you (note : they shouldnt be able to do anything but move around unless they are attatched to a hull)
1) can i make a game like this, or is it an exercise in futility?
2) will it be a big processor hit to have hundreds of units held together in such a way?
3) does anyone like or dislike this idea?
i'm very confident that i would be able to model and skin the units as well as design a meaningful tech tree; i would probably need a hand eventually with animating the units... what i'm really concerned with right now is to find out if i can use a transport behavior in the way i've shown to create a fighting unit / stationary building; this would be instrumental to this ideas success.
thanks in advance for constructive comments :)